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diff --git a/aapl/avlmelkey.h b/aapl/avlmelkey.h
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+/*
+ *  Copyright 2002 Adrian Thurston <thurston@complang.org>
+ */
+
+/*  This file is part of Aapl.
+ *
+ *  Aapl is free software; you can redistribute it and/or modify it under the
+ *  terms of the GNU Lesser General Public License as published by the Free
+ *  Software Foundation; either version 2.1 of the License, or (at your option)
+ *  any later version.
+ *
+ *  Aapl is distributed in the hope that it will be useful, but WITHOUT ANY
+ *  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
+ *  more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with Aapl; if not, write to the Free Software Foundation, Inc., 59
+ *  Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef _AAPL_AVLMELKEY_H
+#define _AAPL_AVLMELKEY_H
+
+#include "compare.h"
+
+/**
+ * \addtogroup avltree 
+ * @{
+ */
+
+/**
+ * \class AvlMelKey
+ * \brief AVL tree for elements appearing in multiple trees with different keys.
+ *
+ * AvlMelKey is similar to AvlMel, except that an additional template
+ * parameter, BaseKey, is provided for resolving ambiguous references to
+ * getKey(). This means that if an element is stored in multiple trees, each
+ * tree can use a different key for ordering the elements in it. Using
+ * AvlMelKey an array of data structures can be indexed with an O(log(n))
+ * search on two or more of the values contained within it and without
+ * allocating any additional data.
+ *
+ * AvlMelKey does not assume ownership of elements in the tree. The destructor
+ * will not delete the elements. If the user wishes to explicitly deallocate
+ * all the items in the tree the empty() routine is available. 
+ *
+ * \include ex_avlmelkey.cpp
+ */
+
+/*@}*/
+
+#define BASE_EL(name) BaseEl::name
+#define BASEKEY(name) BaseKey::name
+#define AVLMEL_CLASSDEF class Element, class Key, class BaseEl, \
+		class BaseKey, class Compare = CmpOrd<Key>
+#define AVLMEL_TEMPDEF class Element, class Key, class BaseEl, \
+		class BaseKey, class Compare
+#define AVLMEL_TEMPUSE Element, Key, BaseEl, BaseKey, Compare
+#define AvlTree AvlMelKey
+
+#include "avlcommon.h"
+
+#undef BASE_EL
+#undef BASEKEY
+#undef AVLMEL_CLASSDEF
+#undef AVLMEL_TEMPDEF
+#undef AVLMEL_TEMPUSE
+#undef AvlTree
+
+#endif /* _AAPL_AVLMELKEY_H */